Lightweight electric motor



Sept. 25, 1951 c. PACE 2,569,330

LIGHTWEIGHT ELECTRIC MOTOR Filed Oct. 27, 1948 INVENTOR? 04 m0 PA 05ATTX Patented Sept. 25, 19 51 UNITED STATES PATENT OFFICE LIGHTWEIGHTELECTRIC MOTOR Canio Pace, Waterbury, Conn.

Application October 27, 1948, Serial No. 56,687

2 Claims.

This invention relates to electric motors, and more particularly to amotor operable on D. C. or A. C. and having improved rotor and statorstructures.

One object of this invention is to provide a rotor of the above naturewherein the rotor core has no laminations, and the windings thereof arecarried upon slotted cups, thereby reducing weight and expense ofconstruction.

Another object is to provide a motor of the above nature in which thestator has a pair of integral end plates which serve as poles and alsoprovide bearings for the rotor whereby its manufacture will be greatlysimplified.

:A further object is to provide a motor of the above nature which willbe simple in construction, inexpensive to manufacture, easy to assembleand manipulate, compact, ornamental in appearance, and very eflicientand durable in use.

With these and other objects in view, there have been illustrated, onthe accompanying drawing, two forms in which the invention mayconveniently be embodied in practice.

'In the drawing,

' Fig. l is a longitudinal sectional view of the improved motor.

Fig. 2 is a cross-sectional view of the same. taken on the line 2-2 ofFig. 1, showing the field coil partly broken away.

Fig. 3 is a perspective view of one of the stator plates.

Fig. 4 is a side view of the rotor showing the arrangement of theslotted cups in the armature core back-to-back, the windings beingomitted.

Fig. 5 is a similar side view of a modified form of rotor core havingthe slotted cups arranged face-to-face.

Fig. 6 is a perspective view of one of the slotted cups.

Referring now to the drawings, in which like reference numerals denotecorresponding parts throughout the several views, the numeral, llindicates generally a stator comprising a cylindrical shell II and apair of identical circular end plates I2, I! which are secured againstthe ends of said shell by means of a pair of screws ll extending throughthe interior of the shell II and engaged in the respective end plates.

The end plates l2, II are preferably made by stamping from soft sheetiron and are provided respectively with a pair of opposed integral polepiece I, It, which are parallel to the axis of the motor and have across section which is curved concentrically therewith.

It will be understood that the end plates II, II are reversed inposition, so that the pole pieces It, I. are diametrically opposedwithin the motor so as to support an annular field coil I! in the spacebetween said pole pieces and the shell II. If desired, however, a statorhaving a permanent magnet may be employed within the scope of theinvention.

In order to conduct electric current from a power source to a commutatorIla, provision is made of suitable brush devices l8, 'II, which aresupported in apertures II in the end plate It, as shown.

The end plates l2, it are also provided with apertures ii for thesecurement of the screws l4, and central bearing apertures 22 in whichthe shaft 23 of a rotor 24 is journaled.

The rotor 24 comprises an armature core in the form of a pair of alignedslotted cups 2!, II, arranged in back-to-back relation. The cups II. 28are preferably stampings of sheet iron and are each provided with acentral aperture 21 whereby said cups may be applied to the rotor shaft23 with a press lit, and also have a plurality of radially-extendingcoplanar arms 28.

The outer end of each of the arms 20 is provided with an enlargedsalient pole piece 20 which is bent at right-angles to the arm and iscurved concentrically with the central aperture 21 so as to be disposedoutwardly of the rotor shaft. It will be seen from Fig. 6 that each ofthe pole pieces 29 is slightly wider than the width of the arms ll, thusassisting in holding ,the armature windings 30 in place upon the arms28. as seen in Fig. 2, and this construction also allows for goodventilation. The armature windings 30 will thus be disposed entirelywithin the confines of the slotted cups 2!, It, so that they will beprotected against damage and will permit a very compact inexpensiverotor structure.

In the alternative arrangement shown in Fig. 5, the slotted cups 2!, 28are disposed in face-toface arrangement, thus permitting the armaturewindings to embrace the respective arms I. and providing a hollowarmature.

It will be understood that any desired number of the slotted cups 2!, 2!may be assembled on a shaft in order to provide an armature of thedesired length, the outermost cups facing either outwardly, as shown inFig. 4, or inwardly as shown in Fig. 5.

It will also be understood that the cups II, It may be spaced apart anydesired distance.

While there have been disclosed in this speciilcation. two forms inwhich the invention may be embodied, it is to be understood that theseforms are shown for the purpose 0! illustration only, and that theinvention is not limited to the specitic disclosures, but may bemodiiied and embodied in various other forms without departing from itsspirit. In short, the invention includes all the modifications andembodiments coming within scope of the following claims.

Having thus fully described the invention, what is claimed as new, andfor which it is desired to secure Letters Patent, is:

1. In an electric motor, a stator comprising a pair 0! end plates havingpole pieces extending inwardly therefrom and integral therewith, a rotorincluding a shaft iournaled within said end plates, said rotorcomprising a pair of slotted cups disposed back-to-back in abuttingrelationship on said shaft, each of said cups comprising a plurality oiradially extending arms, a right angularly extending arcuate poleportion integrally 20 formed with the outer end oi each of said arms,the arcuate length of each of said pole portions being greater than andoverhanging the width oi its associated arm, whereby the rotor windingdisposed about said arms will be constrained inwardly of said poleportions and the axial extent of said pole portions being beyond saidwinding whereby the overhanging outer ends will operate as a fan to coolsaid rotor.

2. In a rotor construction for an electric motor, the combinationcomprising a rotor shaft, a rotor member fixed on said shaft, said rotormember comprising a pair of slotted cups disposed back-to-back inabutting relationship on said 4 shaft, each of said cups comprising aplurality of radially extending arms, a right angularly extendingarcuate pole portion integrally formed on the outer end oi each 0! saidarms, the arcuate length oi each of said pole portions being greaterthan and overhanging the width of its associated arm. whereby the rotorwinding disposed about said arms will be constrained inwardly of saidpole portions the axial extent 0! said pole portions being beyond saidwinding whereby. and the outer ends of said pole portions will operateas a (an to cool said rotor member.

CANIO PACE.

REFERENCES CITED The following references are 01 record in the iile 01this patent:

UNITED STATES PATENTS Number Name' Date 259,404 Little June 13, 1882548,402 Storey Oct. 22, 1895 1,655,286 Nietsche Jan. 3, 1928 1,933,498Morriil Oct. 31, 1933 1,959,391 Spencer May 22, 1934 2,018,678 KohlhagenOct. 29, 1935 2,122,307 Welch June 28, 1938 2,212,192 Howell Aug. 20,1940 2,243,063 Arey May 2'7, 1941 2,294,449 Dickten Sept. 1, 19422,512,848 Brouwer June 27, 1950 FOREIGN PATENTS Number Country Date522,621 Great Britain June 21, 1940

